Crankshaft locator



' p 1943- J. Y. BLAZER ETAL CRANKSHAFT LOCATOR Filed Jan. 15, 1941 .7 MW mm M mm. M M m 6 M a Z m m mwzwmww ATTORNEYS.

Patented Sept. 14, 1943 and Vernon R. Roy, Cleveland, hio',assignors to Lempco Products, Inc., Bedford, Ohio, a corporation of Ohio Application January 15,- 1941', Serial No. 374,507

3 Claims.

wThis invention has general reference to an instrument for locating an article relatively to another article. To be more specific, such instrument is particularly adapted for locating the axis of a pin of a crankshaft relatively to'the axis of rotation of a spindle of a crankshaft grinder.

Such grinders, as is well known to those skilled in the art, conventionally comprise ;,a pair: of self-centering chucks, one for the head stock'and .one for the tailstock, the chucks being slidable along parallel rectilinear slideways which are rotatable along a commonaxis. ,Since, the throw of a crankshaft is aknown quantity, it'will be ,obvious that if the chucks are slid along their respective slideways until the distance between the axis of rotation of such slideways and the center of the chucks is equal to such quantity, 1

Means for causing such coincidence has here- ,toforebeen provided in the form of an inverted ,;Y,the stem of which intersects and is slidable perpendicularly to the axis of rotation of; the slideways and the diverging arms of which, are

adapted for engaging the peripheryof the pin Y which it is desired to grind. However; such means have-not been found to be accurate to, a satis- .factorydegree and a] pronounced want has been felt for more. accurate means. One of the pri ma'ry objects of this invention has been to provide such more accurate crankshaft locating means. -Further objects of this invention have been to provide locating means, as above set forth, which present but one crankshaft engagingsurfaceand which is accurate.

;To the accomplishment of the foregoing andv related ends, said invention, then, consists of the means hereinafterfully described and particularly pointed out in the claims; the annexed drawing and thefollowing description setting I features of this invention, the crankshaft locator being seen in front elevation;

- Fig. 2 is, a partially fragmentary and partially sectional side elevation of the crankshaft locator seen in Fig. 1 and y Fig. 3 is a section taken on theline 3-3 of 5Fie.2. For purposes of illustration we will describe our crankshaft locator in conjunction with the crankshaft grinder, but it will be understood that the same is equally adapted. for use'in conjunclotion with devices other than grinders,- such as lathes or the like. It will be" further understood that the term crankshaft is intended'to cover anyand all articles provided with an eccentric portion. I Thecrankshaft grinder which we have illustrated comprises a base 5 provided with a head stock 6 and atail stock 1 provided with spindles 8 and 9 respectively, the spindle 8 of the head' stock being driven by suitable means It. The

above described slideways, indicated by the reference character I2, are provided on blocks l3 which are carried by the spindles. These slideiways are engaged by slideways of blocks M which in turn carry the above described chucks I5 provided with jaws l6 which are actuated by suitable .control elemental 1. Means may be provided for drivingly interconnecting the spindles so that they rotate in unison with the slideways similarly disposed, or the spindle 9 may be freely rotatable and means comprising a plunger and plunger receiving recess may be provided in the head and tail stock and the spindle so. that when the plunger occupies the plunger receiving recesses, then the spindles are locked against rotation and the slideways l2 are similarly disposed. Suitable indicia l9 maybe provided on adjacentsurfaces of the blocks-so that the center or axis of the chucks may be offsetor spaced from the axis of the spindles an amount equal to the throw or eccentricity of any pin such as the pin 20 0f the crankshaft 0. Suitable steady rest means for the crankshaft is carried by an upwardlyextending block 7 2| which is preferably stationarily mounted onacarriage 22 which in turn is slidable along the crankshaft on longitudinally extending slideways23 of the base; I l 1 Our locator per se will now be described and,

in general, comprises an arm' 30, a surface 3| of which is adapted for engaging the pin 20, the arm being movable means 32 interposed betwen the block and the arm for spacingthe surface 3| from the axisof the spindles. I I i I ,More particularly, the arm 30, and the upper portion ofthe block 2l are provided with trans-i verselyextending horizontally disposed mating.

transversely on the base, and a there being accurately adjustable micrometer jecting through the outer wall 40 of this recess,

which wall may or may not be integral with the arm, is a nut 4| of the above-described microme ter means, the end 42 of the screw of which.

projects into the recess and engages a wear-receiving button 43 which is supported by the block 2|. The other end 45 of this screw is provided with graduations 46 which may be of the type conventionally found on micrometer screws. The

outwardly projecting portion of the nut 4| is provided with graduations 48, preferably provided with a zero point 49 withfg'raduationson "either side thereof. The graduation's 46 and 4B are such that when they are at the zero posi tion, the surface 3| will lie on the axis of the spindle. These graduations preferably directly indicate the diameter rather than the radius of the pin 20, it being noted that the-portion 3l will then be spaced from the axis of the spindle a distance equal to the radius of thepin.

The surface 3| preferably is not unitary nor integral with the arm 30 but is removable and is maintained by means of a bolt 52 which engages a suitable nut 53 provided with wear-resisting material 54 which presents such surface.

This surface is preferably plane and'parallel to the axis of the spindles and is vertically dis- Thus thissurface tangentially engages the pin 20.

We do not wish to be restricted to the particular form of micrometer means which we have described, the same being solely for purposes of i lustration and not for purposes of limitation. For instance, the micrometer screw, instead of being threaded to the arm 3|! and abutting the Cir block 2|, could'be threaded to the latter and abutthe former. It will also be understood that the arm, although shown as movable horizontally, will function equally well if movable other than horizontally.

When it is desired to grind a particular pin, such as the pin 20 of the crankshaft C, the eccentricity (throw) of the axis of such pin with respect to the main axis of the crankshaft is determined'and the diameter of such pin is also determined. The eccentricity can be determined from the crankshaft manufacture'rs specification and the diameter can be determined by direct measurement. Let us assume the eccentricity to be 3 inches and the dlameterto be 1 inches.

The spindles arelocked against rotation with the blocks i3 similarly disposed. The blocks I3 and M will be adjusted until the indicia l9 reads 3 at which time the center of the chucks I5 will be 3 inches from the axis of; the spindles 8 and 9. Our locatcr is then mounted on the block 2|, as

' in Fig. 2-, and the raduations 46' and 48 are set locator is removed by manipulation of the thumb nut 31 and the tool or grind wheel G brought int grinding position with the pin while the crankshaft rotates about the axes of the spindles and of the pin 20, such axes being coincident.

place.

Other modes of applying the principle of our invention may be employed instead of the one explained, change being made as regards the structure herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed. We therefore particularly point out and distinctly claim as our invention:

1. A machine for performing work on a pin of a crankshaft, comprising spindle means for rotating said crankshaft with the main axis of the crankshaft spaced from the axis of said spindle means a distance equal to the throw of said pin, a supporting post carried by the machine and provided with a relatively fixed abutment, an arm slidable on said post and having depending portions at opposite end thereof, an adjustable abutment carried by one of the dependingportions for enga ement with said nx'ed abutment, the other of said depending portions 01' said arm carrying a pin contacting gauge movable along 'a line intersecting the axis of said spindle means for positioning said 151:! concentrically with respect to the axis of said spindle means, said'arm being arranged to position the gauge against the pin with said pin lying between the gauge and post.

2. A machine for performingwork on a pin of a crankshaft, comprising spindle means for rotating said' crankshaft with the main axis of the crankshaft spaced from the axis of said spindle means a distance equal to the throw of said pin, a supporting post carried by the machine and provided with a reiatively'fixed abutment, a slotted arm slidable on said post and having depending portions at opposite ends thereof, anadiustable abutment carried by one of the depending portions for engagement with said fixed abutment, the other of said depending portions of said arm carrying a pin contacting gauge movable along a line intersecting the axis of said spindle means "for positioning said pin concentrically with respect to the axis of'said spindle means, said arm being arranged to position the gauge against the pin with said pin lying between the gauge and post, a bolt extending from the end of the post and passing through theslot in said-arrn-and means carried by the belt for locking the arm in 3. A machine for performing work on a pin or a. crankshaft, comprising a. spindle means for rotating said crankshaft withthemain axis of said crankshaftspace'd from the axis of said spindle means a distance equal to the throw-of said pin,

a supporting post having a slideway at its upper end carried by the machine and provided with a relatively fixed abutment, an arm slldable across the top of said post and having arec'ess therein receiving the slideway of the post, said am having depending portions at opposite ends thereof,

an adjustable abutment carried by one of the depending portions for engagement with said fixed abutment, the other of said depending portions of said arm carrying a pin contacting gauge movable along a line intersecting the axis of said spindlemeans for positioning said pin concentri cally with respect to the axis 'of said spindle means, said arm being arranged to position the gauge against the pin with said pin lying between the gauge and post. I a I JOHN Y. 'BLAZEK.,

GILBERT SEARS. VERNON R. ROY. 

